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Abstract

Alkaline earth metal phosphors are sensitized by the addition of lanthanide and uranium activators to increase their fluorescence.

Country

United States

Language

English (United States)

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Improved Alkaline Earth Metal Phosphors

Alkaline earth metal phosphors are sensitized by the addition of lanthanide
and uranium activators to increase their fluorescence.

An alkaline earth compound which is an oxide at fusion temperature is
uniformly mixed with a lanthanide and uranium salt in a proportion of at least 0.
01%. The mixture is then heated to fusion.

Acid or oxides of tungsten or molybdenum are now added to the mixture and
the material is again heated. The temperature is slightly greater than that of the
first heating.

Since oxides or acids of tungsten and molybdenum are used to supply the
anion portion of the phosphor molecule, the molar ratio of cation to anion must be
almost 1: 1. The presence of a slight excess of cation forming alkaline earth
compounds is desired.